/*******************************************************************************
 *  Copyright 2001, 2007 JamesLuo(JamesLuo.au@gmail.com)
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may not
 *  use this file except in compliance with the License. You may obtain a copy of
 *  the License at
 *  
 *  http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 *  License for the specific language governing permissions and limitations under
 *  the License.
 * 
 *  Contributors:
 *******************************************************************************/


package com.gwtent.client.ui.validate;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class ExpressionProcessorRegister {
	
	//List<ValidateProcessor>
	private List validates = new ArrayList();
	
	private ExpressionProcessorRegister(){
		
	}
	
	private static ExpressionProcessorRegister register = null;
	public static ExpressionProcessorRegister getInstance(){
		if (register == null)
			register = new ExpressionProcessorRegister();
		
		return register;
	}
	
	public void registValidator(ExpressionProcessor validateProcessor){
		validates.add(validateProcessor);
	}
	
	public ExpressionProcessor findProcessor(String expression){
		Iterator iterator = this.iterator();
		while (iterator.hasNext()) {
			ExpressionProcessor processor = (ExpressionProcessor) iterator.next();
			
			if (processor.canProcess(expression)){
				return processor;
			}
		}
		return null;
	}
	
	public Iterator iterator(){
		return validates.iterator();
	}

}
